DIY_EFI Digest Tuesday, June 8 1999 Volume 04 : Number 344 In this issue: Re: Injectors re: 10,000 rpm v8 (okay, one more thing) no CONTENT :^) no CONTENT :^) re: 10,000 rpm v8 (okay, one more thing) Re: Injectors Re: Types of differentials/Traction aiding devices Re: 10,000 RPM Re: Injectors Re: 02 Sensors Re: 02 Sensors Re: 10,000 rpm v8 (how about Pro Stock?) Re: 10,000 rpm v8 (how about Pro Stock?) New Microchip PIC processor. Re: 10,000 rpm v8 (how about Pro Stock?) Re: Viper GTS ACR - (Hey, it's f.i.'d) Re: 10,000 RPM Re: 10,000 rpm v8 (how about Pro Stock?) Re: 02 Sensors Re: metric to english conversion Re: Types of differentials/Traction aiding devices Re: metric Re: 02 Sensors Re: 02 Sensors See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Mon, 07 Jun 1999 18:37:48 -0400 From: "David A. Cooley" Subject: Re: Injectors At 04:07 PM 6/7/99 -0700, you wrote: >WOW! Thanks a lot for that info! > >100 lb.hr is equivelant to how many HP? Or is that the right way to >look at it?.... > a V8 running 100 lb/hr injectors will have enough injector to fuel up to 1280HP at 80% duty cycle on the injectors... >ALSO, If I plan on pushin say 1,000+ hp with a f.i.'d intercooled twin >turbo 440 or 451 cu in engine, with a minimum of 15 lbs. boost under >acceleration, what size injectors should I use at a minimum? > probably 100lb/hr >What's the forumla for this, or where may I find the formulas for proper >injector sizing for various apps? > http://www.rceng.com/ Later, Dave =========================================================== David Cooley N5XMT Internet: N5XMT@xxx.net Packet: N5XMT@xxx. Member #7068 Sponges grow in the ocean... Wonder how deep it would be if they didn't?! =========================================================== ------------------------------ Date: Mon, 7 Jun 1999 19:14:30 -0400 (EDT) From: "Frank/G.speed" Subject: re: 10,000 rpm v8 (okay, one more thing) I didn't catch the beginning of the thread... I posted about Pro Stock engines because after I read about them I was thoroughly impressed by them. As far as "mass produced" engine goes, the highest redline I know is Honda's CRB250RR. Production inline 4 motorcycle engine, factory redline is 18,000 rpm. Easily safe to 20,000 rpm. Hmmm!! Not known as a particular high hp nor torquey motor though. Just known for high rev limit. :) - -- Frank M. Lin | http://www.g-speed.com/pbh Honda related tech files frank@xxx.com/pbh/fastest drag registry Field Electronics, Z.Speed, NASA, skunkworks http://www.g-speed.com The T.O.O. Archive, Endyn - Energy Dynamics http://www.TheOldOne.com ------------------------------ Date: Tue, 08 Jun 1999 09:52:47 +1000 From: Wayne Blair Subject: no CONTENT :^) What Frequency is the signal on ? The signal to noise ratio is very poor ! Bandwidth abuse ? anyone else been asking the same questions ? I'll go back to the corner and keep tuning the filters. sorry for the out burst <<<<<<<<<<<<<<<< bye >>>>>>>>>>>>>>>>> wayne [Brisbane Australia] ------------------------------ Date: Tue, 08 Jun 1999 09:52:47 +1000 From: Wayne Blair Subject: no CONTENT :^) What Frequency is the signal on ? The signal to noise ratio is very poor ! Bandwidth abuse ? anyone else been asking the same questions ? I'll go back to the corner and keep tuning the filters. sorry for the out burst <<<<<<<<<<<<<<<< bye >>>>>>>>>>>>>>>>> wayne [Brisbane Australia] ------------------------------ Date: Mon, 07 Jun 1999 19:58:45 -0400 From: "David A. Cooley" Subject: re: 10,000 rpm v8 (okay, one more thing) At 07:14 PM 6/7/99 -0400, you wrote: It may not hit even 7000 RPM, but the sweetest sound I have heard was last year in Munich... About 7:30-8pm every night, a pair of Vipers would race down the main street in the section I was staying at... Export vipers have no catalytic converters etc... As they flew past at an estimated 70-80MPH, they were at or near redline in 2nd gear and were Music to my ears! =========================================================== David Cooley N5XMT Internet: N5XMT@xxx.net Packet: N5XMT@xxx. Member #7068 Sponges grow in the ocean... Wonder how deep it would be if they didn't?! =========================================================== ------------------------------ Date: Mon, 07 Jun 1999 18:35:25 -0500 From: Jason Haines Subject: Re: Injectors At 12:48 PM 6/7/99 -0600, you wrote: >>Hi Bruce, >> >>Just ran across this e-mail again and just wanted to ask ya what the >>BIGGEST injector flow you've ever heard of is? >> >Bosch makes some 160 #/hr. injectors. I've seen prototype Bosch and other racing injectors with flows as high as 198 lb/hour (25 g/s) at 4 bar. I'll have to check what some of the F1 injectors flow (I don't think they are that high - I think the Indycar engines use some of the largest because of the fuel used). Some of the F1 injectors run at much higher pressures so the flow at 3 or 4 bar would be comparatively small. Jason ------------------------------ Date: Mon, 7 Jun 1999 20:20:16 EDT From: AL8001@xxx.com Subject: Re: Types of differentials/Traction aiding devices In a message dated 99-06-07 16:43:55 EDT, pford@xxx.com writes: >Previously, you (Gary Derian) wrote: >> Tipping over has to do with the CG height and track width. Roll center has >> almost no effect. That truck would have tipped over anyway. > >true but body roll would have warned us before it happened, if your head is >stuck against the side window you have fair warning, if the horizon tilts >the wrong way there is no warning ( we leaned in then boom we were >upsidedown) > >it was a fun ride though > > Sounds like a winged sprint car! te he :+) Harold ------------------------------ Date: Mon, 07 Jun 1999 20:53:48 -0500 From: Steve Gorkowski Subject: Re: 10,000 RPM Ford has a production V8 built Police cars and Mustangs to handle 7k over and over all over the USA and puts a warranty on it. This engine will go higher if you bypass EFI but then your on your own . I think in the price range that can be considered a high rpm engine. It puts a high RPM engine in the hands of the average person. The Chevy Police car must do the same. Steve Squash wrote: > --- "David A. Cooley" wrote: > > At 05:54 AM 6/7/99 -0700, you wrote: > > > I think the original poster stated there were no > > Factory production engines > > (Bone stock as from the dealership ) that would turn > > 10,000RPM. > > I know that. Why is anyone complaining about this > anyways? Production American V-8s are know for > reliable low-end power, in mostly heavy autos. Who > does have a production V-8 that turns a zillion RPM. > > Andy > _________________________________________________________ > Do You Yahoo!? > Get your free @xxx.com ------------------------------ Date: Mon, 7 Jun 1999 19:37:51 -0600 From: bearbvd@xxx.net (Greg Hermann) Subject: Re: Injectors >HOLY COW! > >Is it safe to assume that these injectors are for high output throttle >body injection systems? Can't imagine what kinda power an engine with >that size injector must be doin!! > >Any clues? Actually, I think the 160's are meant mostly for methanol fueled motors--on gasoline you could get pretty reasonably into the 2000 HP neighborhood--if ya had something big enough and with enough boost to do that. Greg > >WOW again! > >LATER! > >Todd.... > >---------- > >Greg Hermann wrote: >> >> >Hi Bruce, >> > >> >Just ran across this e-mail again and just wanted to ask ya what the >> >BIGGEST injector flow you've ever heard of is? >> > >> Bosch makes some 160 #/hr. injectors. >> >> Greg ------------------------------ Date: Mon, 07 Jun 1999 19:47:59 -0700 From: garfield@xxx.com (Gar Willis) Subject: Re: 02 Sensors On Mon, 7 Jun 1999 07:34:44 -0600, bearbvd@xxx.net (Greg Hermann) wrote: >I too have heard this urban legend--but would almost lay odds that it was >started by a Horiba lawyer just as likely as whichever meter mfgr Gar is >talking about! Hahahaha, yeah, now THAT would be a good one! Taking "turnabout is fair play" to a bizarre extreme. Hee. Just spose Horiba first issued this nonsense to diss the competition, thinking that with their exclusive agreement with NTK, nobody could fight this bullshit, NOR prove it false;... but INSTEAD of this one competitor trying to fight the propaganda, they EMBRACE it instead !!, claim their sensors ALSO come directly from NTK, and therefore don't suffer from this dread "richness" disease EITHER, whilst all the while buying them from their local Honda dealer. Bwahahahaha. Yeah, now THAT's the usual automotive snakeoil/diss'ing I've become all too used to, only on steroids this time! Whada world, eh? The same guy that owns this well-known company was the one that told me personally on the phone when I first started getting interested in this whole topic (I mentioned this some time back on DIY), that it would take someone 5yrs of engineering development to build their own AFR meter, it was so 'difficult'. He apparently propagates all these cute little myths to even his distributors, so he's formed a cadre of unsuspecting dupes, all working to discourage others from hobby investigation or entering the market, while he sucks contentedly on the teets of his lil cash cow. Sheesh, whada shyster. Honest technical prowess I can respect, but a major case of muddying the waters to make them look deep, merits the "used-car salesman" warning label, IMO. Gar ------------------------------ Date: Mon, 07 Jun 1999 19:54:43 -0700 From: garfield@xxx.com (Gar Willis) Subject: Re: 02 Sensors On Mon, 7 Jun 1999 09:56:27 +0200, "Espen Hilde" wrote: >How is egor doin these days? Well, he's been dragged from the site of the AirSIG tomb, and is about to be unpacked in our new facilities. The move was completed over the Memorial Day weekend, but there's a ton of unpacking/rearranging/setup of our shop before we're underway. I'll keep ya posted as we pass the major milestones leading up to "V-E Day". The E there stands for EGOR, of course. B) Gar ------------------------------ Date: Mon, 07 Jun 1999 19:43:08 -0700 From: ".." Subject: Re: 10,000 rpm v8 (how about Pro Stock?) Aaron Willis wrote: > I have to take exception to this...several prod. V-8s (BBC and Mopar Hemi > come immediately to mind) were very much designed with competition in mind. > BUT - the race Hemi's (and race Wedges) were not available to the general public. You had to present your competition license AND references that you ran in the top percentage of your class. The famous L88 BBC's were more difficult to come by, although you didn't have to have a racing background to buy them - but they certainly weren't available to the general public. None of these engines would even start to approach 10 grand on your tach, anyway. The street Hemi's were OK for Grandma to drive, and were a dime a dozen (in comparison), but could hardly be considered quick; same for the run of the mill 427 and 454 BBC's. rap ------------------------------ Date: Mon, 07 Jun 1999 19:50:23 -0700 From: ".." Subject: Re: 10,000 rpm v8 (how about Pro Stock?) Todd; It's starting to sound like you'd be impressed by a Yugo with Racing Stripes!! rap "Todd....!!" wrote: > Oops Andy, ya pretty much put your foot in your mouth this time... > > Viper GTSR, Viper GTS-ACR.... > > These are two production built race cars, come with full 5 point harness > seat belts, etc etc... > > They were and are Designed, Produced and Sold for racing... > > Kinda like the Super Stock Hemi cars of the late 60's, 68 Race Hemi > Cuda's and Darts... Even had a sticker on em that said "Not for use on > public hiways" or somethin like that, have a friend who drives an > original 68 Race Hemi Cuda on the Streets of Houston, he can do it, he's > rich, it's not all original any more anyways, has strange axles and > aftermarket front and read disc brakes n stuff like that.... for safety > n all... > > Matter of fact Greenspoint Dodge in north Houston has a VERY cool lookin > ALL Silver(No stripes) Viper GTS-ACR on their showroom floor if ya wanna > take a gander at a REAL production all race vehicle... > > Take er easy mang... > > LATER! > > Todd.... > http://www.c-com.net/~atc347/toddlnk.htm > > Squash wrote: > > > > Who needs a production V-8 to spin that fast anyways? > > Production V-8s are not meant for racing, and that is > > why you can't buy a production race car! > > > > Andy > > > > --- Shannen Durphey wrote: > > > Bill Edgeworth wrote: > > > > > > > > "Frank/G.speed" wrote: > > > > > > > > > How about NHRA Pro Stock motors? 500 ci, 1300+ > > > hp, 800+ ft-lbs, > > > > > 9000+ rpm... naturally aspirated. > > > > > > > > > > > > > The original comment was that NO AMERICAN > > > PRODUCTION CAR CAME WITH A V8 > > > > THAT WAS MADE TO TURN 10,000 RPM. > > > > Sorry but I don't think you can go down (or ever > > > could) to your local > > > > Chev dealer and buy a car with a aluminum or > > > titanium rodded, jessel > > > > rocker geared engine with a knife edged 4340 crank > > > > > > You're changing what you're saying, methinks. > > > Production engines > > > aside, you're now implying that 10k can't be reached > > > without these > > > parts. Somebody's going to have to tell the little > > > old V-8 guys they > > > couldn't get their engines to rev. > > > > > > I'm not the expert. I'm just noticing a subtle > > > twist. I'm thinking > > > that there certainly must be engines that hit that > > > rpm without the > > > trick parts you mention. Maybe they're not V8s, but > > > given a small > > > enough bore and stroke, and small enough valves, and > > > the upper rpm > > > limits have to get pretty high. > > > > > > I wonder what was really available, depending on who > > > you were and who > > > your local Chevy dealer was. > > > Shannen > > > > > > > > > > _________________________________________________________ > > Do You Yahoo!? > > Get your free @xxx.com ------------------------------ Date: Mon, 07 Jun 1999 19:55:19 PDT From: Bill the arcstarter Subject: New Microchip PIC processor. Guys, Microchip has just put into production an intesting fully flash processor which might be just about right for DIY_EFI applications: http://www.microchip.com/10/Lit/PICmicro/16F87X/index.htm This little guy contains all sort of goodies including: Uart PWM 5 or 8 channel 10bit A to D converters 8kwords Flash for Program AND/OR data i/o out the wazoo The important thing here is that uchip has finally done two things to their flash parts: 1) Included enough space (8K) to use useful 2) Allowed the processor to read/write the program space at runtime. This would be very useful for fuel maps and the like. Prior to this processor - that sort of thing would have required addition components. Best of all - you can do in circuit programming and breakpointing via a 3-pin interface, via a $150 MPLAB-ICD device. Thats a nice price. The parts are supposed to be something like $8. Not sure if it has been in production long enough to actually be acquireable or not. Thought someone might care about this. - -Bill _______________________________________________________________ Get Free Email and Do More On The Web. Visit http://www.msn.com ------------------------------ Date: Mon, 07 Jun 1999 20:11:23 -0700 From: ".." Subject: Re: 10,000 rpm v8 (how about Pro Stock?) "Todd....!!" wrote: > Then the 1970 AAR Cuda (AAR = American Auto Racing) (340 6-pac engine) > And the 1970 T/A Challenger (T/A = Track and ? Don't remember)(340 6-pac > engine) The only Cuda's and Challengers that were factory built for racing was the cars that were set up specifically for the S.C.C.A. TransAm classes starting in the late 60's. Chrysler used after market cams, manifolds and headers on these race only engines. The exhausts were hardly "tuned out in front of the tires" as they were standard aftermarket headers that anyone could buy at the time. The race Cuda's and Challengers were limited by the rules of the day to 5 liters (305 cu.in) and had 2 4-barrels- not 340-6 packs. However, the cars built for the advertising campaigns (so all the kids could ooh and ahh) WERE 340 6 packs. And the non-competition oriented "dummys" (that's how the PR guys viewed the general public drooling over the fences at race cars) who ate all their baloney PR up, were buying the cars in droves - and worshipping the ground they puked oil on.... > > > The SS Hemi's had a set of headers and glass packs in the trunk(Not > installed!) Wrong, the SS cars were unloaded right off the trailer from Chrysler with the exhausts in place - I know - I bought a '64 Max Wedge (these came with cast iron headers in place at first, then '65 and '66 SS Hemi's. Chrysler left nothing to chance on the race only cars. Their cost to build these cars was estimated to be in excess of $50,000 each (in '60's dollars) and were sold at less then 10% of their construction costs. They didn't let these race only out to just anybody as they were _determined_ to knock Ford and Chevy down in the youth market by fielding some well prepared cars for their ad campaigns - and it worked well at the time.. rap ------------------------------ Date: Mon, 07 Jun 1999 20:34:05 -0700 From: ".." Subject: Re: Viper GTS ACR - (Hey, it's f.i.'d) "Dodge engineers extracted 10 extra ponies and better response from the massive 8.0-liter, V-10 engine just by changing the air filter from the stock setup to a less restrictive unit made by K&N." Sure is HiTech racing????? But, not a bad performance increase for a Truck engine.... rap "Todd....!!" wrote: > More tidbits bout the Viper ACR... > > http://www.vipercentral.com/ > > http://www.vipercentral.com/viperacr/viperacr.htm > > Look Ma, there's even a NEON ACR!! > > http://www.vipercentral.com/neonacr/neonacr.htm > > LATER TATERS! > > Todd.... > http://www.c-com.net/~atc347/toddlnk.htm ------------------------------ Date: Tue, 08 Jun 1999 00:07:36 -0400 From: "David A. Cooley" Subject: Re: 10,000 RPM At 08:53 PM 6/7/99 -0500, you wrote: >Ford has a production V8 built Police cars and Mustangs to handle 7k >over and over all over the USA and puts a warranty on it. This engine >will go higher if you bypass EFI but then your on your own . I think in >the price range that can be considered a high rpm engine. It puts a high >RPM engine in the hands of the average person. The Chevy Police car must >do the same. I'd like to see documentation on that... I have driven MANY Ford and Chevy police vehicles and never saw one that had any higher red-line than it's civilian counterpart. Police packages typically are silicone hoses for coolant, higher capacity cooling system, larger alternator/battery for powering the lights and radios, extra power taps in the fuse boxes, and possibly a different gearing. Federal law for emissions keeps law enforcement agencies to the same calibrations in the ECM's as civilian vehicles with the exception of top speed limiters. =========================================================== David Cooley N5XMT Internet: N5XMT@xxx.net Packet: N5XMT@xxx. Member #7068 Sponges grow in the ocean... Wonder how deep it would be if they didn't?! =========================================================== ------------------------------ Date: Mon, 07 Jun 1999 23:13:52 -0700 From: Aaron Willis Subject: Re: 10,000 rpm v8 (how about Pro Stock?) At 07:43 PM 6/7/99 -0700, you wrote: >BUT - the race Hemi's (and race Wedges) were not available to the general public. No. Sorry, I only meant to say that their DESIGN, not state of tune, was competition-oriented. None of these engines would even start to >approach 10 grand on your tach, anyway. Sure, I bet not. For the record, i doubt very much that anybody's street V8 is gonna ever see 10K...just hitting the thread where I can here!! > >The street Hemi's were OK for Grandma to drive, and were a dime a dozen (in >comparison), but could hardly be considered quick; same for the run of the mill 427 >and 454 BBC's. >rap > > With so many different 427s and 454s available, the doggier ones were I'm sure NOT quick. But the hot ones...makes me wish I was alive back then! Ah well... Aaron Willis ICQ #27386985 AOL IM: hemiyota http://surf.to/garage-te51 Garage TE51 International ------------------------------ Date: Tue, 8 Jun 1999 03:07:45 -0400 From: Raymond C Drouillard Subject: Re: 02 Sensors On Mon, 7 Jun 1999 07:34:44 -0600 bearbvd@xxx.net (Greg Hermann) writes: >>Industrial grade uego.......thanks for letting us know! >>Espen. >>How is egor doin these days? > >I too have heard this urban legend--but would almost lay odds that it >was >started by a Horiba lawyer just as likely as whichever meter mfgr Gar >is >talking about! > >Greg >> >> >>> But there's also a current marketing/disinformation myth that one of the >>> well-known US mfgs. of high end AFR meters has been promoting, which is >>> that the stock Honda/NTK sensors are "not suitable for measuring rich >>> AFR, and will only last a short time in this environment", > I'm not too concerned. I only use WOT for a few seconds at a time, anyhow. Once it goes lean, it'll clean itself out. Ray ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj. ------------------------------ Date: Tue, 8 Jun 1999 03:04:42 -0400 From: Raymond C Drouillard Subject: Re: metric to english conversion On Mon, 7 Jun 1999 08:43:39 -0400 (EDT) Pat Ford writes: >Previously, you (Raymond C Drouillard) wrote: >> Greg, >> >> Is your business ISO 9000 certified? :-) >> >> (My place of employment started going for it, but they started going for >> TQM several years ago. I wonder what the next fad will be) > >read dilbert ( the comic) he knows 8) Dilbert tends to hit the nail on the head. You can tell that Scott Adams used to work in a corporate environment. ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj. ------------------------------ Date: Tue, 8 Jun 1999 03:19:03 -0400 From: Raymond C Drouillard Subject: Re: Types of differentials/Traction aiding devices It will have some effect. Exactly how much effect depends on how fart the CG and roll center are. When cornering, the CG will be moved towards the outside of the curve, which will increase the tendency to roll over. The fact that the top is leaning INTO the curve will increase the driver confidenc and/or mess up his "feel" for the situation. Of course, having the CG above the roll center will also allow the CG to move towards the outside of the curve. On the other hand, it causes a higher percieved side force (acceleration, to be precise) for the driver, so he will have a better "feel" for the situation and will have less tendency to overdrive the vehicle. For the record, a motorcycle's (or bicycle's) CG moves towards the INSIDE of the curve because the driver causes it to happen. Ray Drouillard On Mon, 7 Jun 1999 13:11:53 -0400 "Gary Derian" writes: >Tipping over has to do with the CG height and track width. Roll >center has >almost no effect. That truck would have tipped over anyway. > >Gary Derian > > >> this brings to mind a cool screw up I did, I reworked the suspension >> on a truck that is used 90% offroad. one of the side effects of the >> mods was that the roll center was above the cg. when you cornered >the >> sensation was that you felt like you were in a boat. the toyota >leaned >> in on curves. the downside was that it tipped over on road if you >> overcooked a corner. >> > > ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj. ------------------------------ Date: Tue, 8 Jun 1999 03:05:30 EDT From: Regnirps@xxx.com Subject: Re: metric In a message dated 6/7/99 2:18:03 PM, McGonegal.Will@xxx.ca writes: >Take for instance power. To get a car of 2000 kg (approx. 4400 lbs) to >accelerate at >4 meters per second squared (8.95 mph/s) at a speed (on level ground) of >25 meters/second (55.9 mph) takes 2000 * 4 * 25 = 200000 Watts (200 Kw, or >268.2 Hp). Much simpler math (less conversion factors) with metric for engineering >calculations. I agree completely, until you start working with E&M. Electricity and magnetism is a mess. Charlie Springer ------------------------------ Date: Mon, 7 Jun 1999 22:02:37 +1000 From: "Geffro" Subject: Re: 02 Sensors an AFR meter (not the one >you build for $20.00 for your car) uses a linear O2 sensor that has a >voltage or current output that is varying in a linear fashion with the A/F >ratio. they only last a short period of time, and are really expensive. Thanks for clearing that up for me How much difference do ya reckon it makes for tuning ? Thanks Geoff ------------------------------ Date: Mon, 7 Jun 1999 22:14:35 +1000 From: "Geffro" Subject: Re: 02 Sensors >I just finished making one last night... using a schematic off the >diyefi ftpsite. Anyway, using one of those 10 LED bargraph displays, a >very small piece of perf-board, I can almost shove it into a 2-1/4" >guage housing. Just have to round the edges of the perf-board. I have built one of these from an electronics store in Australia with the parts supplied in kit form and was wondering if the more electrically minded in the group might be kind enough to tell me what the 'bar' (as marked on the pcb) is for ? This bar is a break in the circuit on the 12v feed side of the last led before the circuit reaches the ic It is marked on the pcb with an arrow pointing to either side of the break TIA Geoff ------------------------------ End of DIY_EFI Digest V4 #344 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".